Show hide bottom bar on vertical scroll

forem · Feb 23, 2023 · d267045 · d267045
1 parent e5d1562
commit d267045
Show file tree

Hide file tree

Showing 3 changed files with 38 additions and 3 deletions.
diff --git a/app/src/main/java/com/foremlibrary/app/MainActivity.kt b/app/src/main/java/com/foremlibrary/app/MainActivity.kt
@@ -8,6 +8,7 @@ import android.widget.FrameLayout
 import android.widget.ImageView
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
+import androidx.constraintlayout.widget.ConstraintLayout
 import com.forem.webview.WebViewConstants
 import com.forem.webview.WebViewFragment
 import com.forem.webview.utils.WebViewStatus
@@ -34,6 +35,7 @@ class MainActivity : AppCompatActivity() {
 
     private var currentForem = DEV_TO
 
+    private lateinit var bottomNavigationBar: ConstraintLayout
     private lateinit var loadingViewContainer: FrameLayout
     private lateinit var foremNameTextView: TextView
     private lateinit var backImageView: ImageView
@@ -51,6 +53,7 @@ class MainActivity : AppCompatActivity() {
             loadOrUpdateFragment(url)
         }
 
+        bottomNavigationBar = findViewById(R.id.bottom_navigation_container)
         loadingViewContainer = findViewById(R.id.loading_view_container)
         foremNameTextView = findViewById(R.id.forem_name_text_view)
         backImageView = findViewById(R.id.back_image_view)
@@ -128,6 +131,13 @@ class MainActivity : AppCompatActivity() {
                     loadingViewContainer.visibility = View.GONE
                 }
             }
+            webViewFragment.hideBottomNavigationBar.observe(this) { hideBottomBar ->
+                if (hideBottomBar) {
+                    bottomNavigationBar.visibility = View.GONE
+                } else {
+                    bottomNavigationBar.visibility = View.VISIBLE
+                }
+            }
         } else {
             getWebViewFragment()?.updateForemInstance(url)
         }

diff --git a/foremwebview/build.gradle b/foremwebview/build.gradle
@@ -4,8 +4,8 @@ plugins {
   id 'maven-publish'
 }
 ext{
-  version_code = 16
-  version_name = "1.0.16"
+  version_code = 17
+  version_name = "1.0.17"
 }
 
 android {

diff --git a/foremwebview/src/main/java/com/forem/webview/WebViewFragment.kt b/foremwebview/src/main/java/com/forem/webview/WebViewFragment.kt
@@ -77,6 +77,11 @@ class WebViewFragment : Fragment(), FileChooserListener {
     /** Provides an observable which can reflect the current status of WebView. */
     val currentWebViewStatus = MutableLiveData(WebViewStatus.LOADING)
 
+    // This is required so as to compare with next upcoming y coordinate and accordingly decide
+    // if the scroll/movement was upward or downward.
+    private var currentYCoordinate = 0
+    val hideBottomNavigationBar = MutableLiveData(false)
+
     private val imagePickerLauncher =
         registerForActivityResult(ActivityResultContracts.StartActivityForResult()) { result ->
             if (result.resultCode == Activity.RESULT_OK && result.data != null && result.data?.data != null) {
@@ -97,6 +102,7 @@ class WebViewFragment : Fragment(), FileChooserListener {
         val view = inflater.inflate(R.layout.web_view_fragment, container, false)
 
         currentWebViewStatus.value = WebViewStatus.LOADING
+        hideBottomNavigationBar.value = false
 
         noInternetConnectionContainer = view.findViewById(R.id.no_internet_connection_container)
         webView = view.findViewById(R.id.web_view)
@@ -187,6 +193,25 @@ class WebViewFragment : Fragment(), FileChooserListener {
         webView!!.webChromeClient = ForemWebChromeClient(fileChooserListener = this)
 
         webView!!.loadUrl(baseUrl)
+        setWebViewScrollListener(webView!!)
+    }
+
+    private fun setWebViewScrollListener(webView: WebView) {
+        webView.viewTreeObserver.addOnScrollChangedListener {
+            when {
+                currentYCoordinate > webView.scrollY -> {
+                    hideBottomNavigationBar.value = false
+                }
+                currentYCoordinate <= webView.scrollY -> {
+                    hideBottomNavigationBar.value = true
+                }
+                else -> {
+                    // Save side check, will never arise ideally
+                    hideBottomNavigationBar.value = false
+                }
+            }
+            currentYCoordinate = webView.scrollY
+        }
     }
 
     @SuppressLint("SetJavaScriptEnabled")
@@ -316,7 +341,7 @@ class WebViewFragment : Fragment(), FileChooserListener {
             } else {
                 destroyOauthWebView()
             }
-        } else if (oauthWebView == null && webView!=null && webView!!.canGoBack()) {
+        } else if (oauthWebView == null && webView != null && webView!!.canGoBack()) {
             // Case where oauthWebView is fully inactive.
             webView?.goBack()
         } else {